TANK AS-BOTTOM 7W7462 - Caterpillar

Illustration 1 g00848951
This is an illustration of the left side of the 3616 aftercooler. (1) Piping from the aftercooler housing (2) Bypass valve housing (3) Turbocharger compressor bypass valve (4) Aftercooler housing (5) Excess boost pressure is directed to the engine exhaust manifolds.The correct operation of the turbocharger compressor bypass valve is critical to the effective operation of the engine.Note: Do not operate the engine without a load with the compressor bypass valve open. This can allow exhaust gases from the exhaust manifold to flow backward through the turbocharger compressor bypass valve and into the aftercooler. Exhaust gases could contaminate the aftercooler. Contamination may restrict the air flow through the aftercooler core. The restriction can cause poor engine performance. In some cases, the engine can overheat.
Illustration 2 g00849572
This is an illustration of the Turbocharger Compressor Bypass Valve. (6) Valve (7) Bypass valve housing (8) Air inlet port (9) Diaphragm (10) SpringThe turbocharger compressor bypass valve is mounted in the bypass valve housing. The bypass valve housing is mounted to the aftercooler cover. The bypass valve is cooled with water from the aftercooler circuit.Note: The turbocharger compressor bypass valve is a normally closed valve. The valve is held in the closed position by a spring within the bypass valve housing. A speed sensor is constantly monitoring the engine RPM. Setpoints that are based on the engine RPM control a solenoid that supplies pressurized air to the turbocharger compressor bypass valve. The bypass valve is pneumatically actuated by compressed air from the air start system.The Sequence of Events for the Turbocharger Compressor Bypass Valve
As the engine accelerates from low idle to the rated speed of 1020 RPM, the following sequence of events occur:
When the engine accelerates to 580 RPM the bypass control energizes the air solenoid valve after a 2